1 /* Native-dependent code for FreeBSD/sparc64.
2
3 Copyright (C) 2003-2020 Free Software Foundation, Inc.
4
5 This file is part of GDB.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
19
20 #include "defs.h"
21 #include "regcache.h"
22 #include "target.h"
23
24 #include "fbsd-nat.h"
25 #include "sparc64-tdep.h"
26 #include "sparc-nat.h"
27
28
29 /* Support for debugging kernel virtual memory images. */
30
31 #include <sys/types.h>
32 #include <machine/pcb.h>
33
34 #include "bsd-kvm.h"
35
36 static int
sparc64fbsd_kvm_supply_pcb(struct regcache * regcache,struct pcb * pcb)37 sparc64fbsd_kvm_supply_pcb (struct regcache *regcache, struct pcb *pcb)
38 {
39 /* The following is true for FreeBSD 5.4:
40
41 The pcb contains %sp and %pc. Since the register windows are
42 explicitly flushed, we can find the `local' and `in' registers on
43 the stack. */
44
45 /* The stack pointer shouldn't be zero. */
46 if (pcb->pcb_sp == 0)
47 return 0;
48
49 regcache->raw_supply (SPARC_SP_REGNUM, &pcb->pcb_sp);
50 regcache->raw_supply (SPARC64_PC_REGNUM, &pcb->pcb_pc);
51
52 /* Synthesize %npc. */
53 pcb->pcb_pc += 4;
54 regcache->raw_supply (SPARC64_NPC_REGNUM, &pcb->pcb_pc);
55
56 /* Read `local' and `in' registers from the stack. */
57 sparc_supply_rwindow (regcache, pcb->pcb_sp, -1);
58
59 return 1;
60 }
61
62 /* Add some extra features to the generic SPARC target. */
63 static sparc_target<fbsd_nat_target> the_sparc64_fbsd_nat_target;
64
65 void _initialize_sparc64fbsd_nat ();
66 void
_initialize_sparc64fbsd_nat()67 _initialize_sparc64fbsd_nat ()
68 {
69 add_inf_child_target (&the_sparc64_fbsd_nat_target);
70
71 sparc_gregmap = &sparc64fbsd_gregmap;
72
73 /* Support debugging kernel virtual memory images. */
74 bsd_kvm_add_target (sparc64fbsd_kvm_supply_pcb);
75 }
76